The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 18, 2001
Filed:
Jan. 25, 2000
Minebea Co., Ltd., Nagano-Ken, JP;
Abstract
The present invention provides, in a single phase-structure actuator, a rotor magnet structure having characteristics wherein detent torque is fully assured, and there is also a large rotation angle range. In a single phase-structure claw pole-type actuator,which constitutes an armature,constituted from stator yokes,which constitute a pair of donut-shaped flat yokes,comprising a Soft-Magnetic material, and pole tooth,which protrude in the axial direction from the inner rim of these flat yokes, and extend in the circumferential direction, and a cylindrical ring,which extends in the same direction as the pole tooth,on the outer rim of a yoke, and from a coil,which is formed by winding an insulating wire, and which is provided in a toroidal concave coil holder portion, which is formed from the flat yokes, pole tooth, and cylindrical ring of the stator yoke, and, in a stator assembly, having bearings,equipped flanges,at both end faces of this stator, causes a rotor,which is equipped with a field magnet comprising a permanent magnet rotor (hereinafter referred to as “rotor magnet” to face the pole tooth of this stator by way of a minute gap, the rotor magnet,is a cylindrical shape, and a plurality of magnets are connected in the axial direction, and the magnetic poles of each magnet are mutually shifted in the circumferential direction.